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A liquid-nitrogen container is made of a...

A liquid-nitrogen container is made of a `1-cm` thick styrofoam sheet having thermal conductivity `0.025Js^(-1)m^(-1)`^(@)C^(1)` . Liquid nitrogen at 80K is kept in it. A total area of `0.80m^(-2)` is in contcet with the liquid nitrogen. The atmospheric temperature is `300K` . Calculate the rate of heat flow from the atmosphere to the liquid nitrogen.

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